Dead Space, the blockbuster alien-slaughter game from Electronic Arts, has been released as a pair of games for iPhone and iPad—the two sharing an exclusive storyline that “sets the stage” for the company’s Dead Space 2, which was also released Tuesday.

For the iOS Dead Space story, three years have passed since the events of the original game. You face off against the savage Necromorph aliens while on a mystery-shrouded mission to the Mines of Titan. EA says it has retained the “cinematic horror” of the game while fitting it into an iOS environment: the on-screen HUD is integrated into the game’s ecosystem of swipe-and-tap controls. See the video below for a demonstration of the iPhone gameplay.

Fans of the franchise should be excited by new features in the iOS version of the game, including new weapons like the “plasma saw” and “core extractor.” An in-game store lets you pay to upgrade weapons, unlock sealed doors, increase your offensive and defensive capabilities, or boost the value of credits scavenged from defeated and dead Necromorphs.

If you register an in-app account with EA, you’ll receive an unlock code to be used in the console version of Dead Space 2. The iPhone version costs $7 and is compatible with any device running iOS 3.0 or later; the HD iPad version costs $10, and runs on iPads with iOS 3.2 or later.